Add ALLOW FILTERING clause for CQL

src/Assembler/CQL/CqlAssembler.php

@@ -2,6 +2,7 @@
 namespace Packaged\QueryBuilder\Assembler\CQL;
 
 use Packaged\QueryBuilder\Assembler\MySQL\MySQLAssembler;
+use Packaged\QueryBuilder\Clause\CQL\AllowFilteringClause;
 use Packaged\QueryBuilder\Expression\FieldExpression;
 use Packaged\QueryBuilder\Expression\TableExpression;
 use Packaged\QueryBuilder\Expression\ValueExpression;
@@ -15,7 +16,11 @@ class CqlAssembler extends MySQLAssembler
 {
   public function assembleSegment($segment)
   {
-    if($segment instanceof AllSelectExpression)
+    if($segment instanceof AllowFilteringClause)
+    {
+      return 'ALLOW FILTERING';
+    }
+    else if($segment instanceof AllSelectExpression)
     {
       $segment->setTable(null);
     }

src/Clause/CQL/AllowFilteringClause.php

@@ -0,0 +1,23 @@
+<?php
+namespace Packaged\QueryBuilder\Clause\CQL;
+
+use Packaged\QueryBuilder\Clause\IClause;
+
+class AllowFilteringClause implements IClause
+{
+  /**
+   * @return string
+   */
+  public function getAction()
+  {
+    return 'ALLOW_FILTERING';
+  }
+
+  /**
+   * @return bool
+   */
+  public function allowMultiple()
+  {
+    return false;
+  }
+}

src/Statement/CQL/CqlQueryStatement.php

@@ -0,0 +1,14 @@
+<?php
+namespace Packaged\QueryBuilder\Statement\CQL;
+
+use Packaged\QueryBuilder\Statement\QueryStatement;
+
+class CqlQueryStatement extends QueryStatement
+{
+  protected function _getOrder()
+  {
+    $order   = parent::_getOrder();
+    $order[] = 'ALLOW_FILTERING';
+    return $order;
+  }
+}

tests/Statement/CqlQueryStatementTest.php

@@ -0,0 +1,24 @@
+<?php
+namespace Packaged\Tests\QueryBuilder\Statement;
+
+use Packaged\QueryBuilder\Assembler\CQL\CqlAssembler;
+use Packaged\QueryBuilder\Clause\CQL\AllowFilteringClause;
+use Packaged\QueryBuilder\Clause\SelectClause;
+use Packaged\QueryBuilder\SelectExpression\AllSelectExpression;
+use Packaged\QueryBuilder\Statement\CQL\CqlQueryStatement;
+
+class CqlQueryStatementTest extends \PHPUnit_Framework_TestCase
+{
+  public function testAssemble()
+  {
+    $statement = new CqlQueryStatement();
+    $select    = new SelectClause();
+    $select->addExpression(new AllSelectExpression());
+    $statement->addClause($select);
+    $statement->addClause(new AllowFilteringClause());
+    $this->assertEquals(
+      'SELECT * ALLOW FILTERING',
+      CqlAssembler::stringify($statement)
+    );
+  }
+}